Nouns starting with O that are validated

• order Ustilaginales — Noun – English ～ parasitic fungi causing smuts; sometimes placed in class Tiliomycetes
• oral poliovirus vaccine — Noun – English ～ an oral vaccine (containing live but weakened poliovirus) that is given to provide immunity to poliomyelitis
• Oswald Veblen — Noun – English ～ United States mathematician (1880-1960)
• ophthalmic vein — Noun – English ～ either of two veins that serve the eye; empties into the cavernous sinus
• ovarian vein — Noun – English ～ one of the veins that drain the ovaries; the right opens into the inferior vena cava; the left opens into the left renal vein
• oblique vein of the left atrium — Noun – English ～ a tributary of the coronary sinus; on the posterior wall of the left atrium
• occipital vein — Noun – English ～ a vein that drains the occipital region
• obturator vein — Noun – English ～ a vein formed by the union of tributaries that drain the hip joints and thigh muscles; empties into the internal iliac vein
• oesophageal veins — Noun – English ～ small veins from the esophagus emptying into the brachiocephalic vein or the azygos veins
• offentlig vej — Noun – Danish ～ vej som ejes og vedligeholdes af kommune, amt el. ...
• object of the verb — Noun – English ～ the object that receives the direct action of the verb
• Opheodrys vernalis — Noun – English ～ of western and central United States
• Ortilis vetula macalli — Noun – English ～ of Mexico and Texas
• Onobrychis viciaefolia — Noun – English ～ Eurasian perennial herb having pale pink flowers and curved pods; naturalized in Britain and North America grasslands on calcareous soils; important forage crop and source of honey in Britain
• Onobrychis viciifolia — Noun – English ～ Eurasian perennial herb having pale pink flowers and curved pods; naturalized in Britain and North America grasslands on calcareous soils; important forage crop and source of honey in Britain
• Ovis vignei — Noun – English ～ bearded reddish sheep of southern Asia
• Oxalis violacea — Noun – English ～ perennial herb of eastern North America with palmately compound leaves and usually rose-purple flowers
• Ostrya virginiana — Noun – English ～ medium-sized hop hornbeam of eastern North America
• Odocoileus Virginianus — Noun – English ～ common North American deer; tail has a white underside
• oil of vitriol — Noun – English ～ (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry

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